tests/migration: Support cross compilation in generating boot header file

Recently a new configure option, CROSS_CC_GUEST, was added to
$(TARGET)-softmmu/config-target.mak to support TCG-related tests. This
patch tries to leverage this option to support cross compilation when the
migration boot block file is being re-generated:

 * The x86 related files are moved to a new sub-dir (named ./i386).
 * A new top-layer Makefile is created in tests/migration/ directory.
   This Makefile searches and parses CROSS_CC_GUEST to generate CROSS_PREFIX.
   The CROSS_PREFIX, if available, is then passed to migration/$ARCH/Makefile.

Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Wei Huang <wei@redhat.com>
Message-Id: <1536174934-26022-3-git-send-email-wei@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

4 files changed, 50 insertions, 28 deletions

diff --git a/tests/migration/Makefile b/tests/migration/Makefile
index c0824b4fbe..dc3b551976 100644
--- a/tests/migration/Makefile
+++ b/tests/migration/Makefile
@@ -1,31 +1,35 @@
-# To specify cross compiler prefix, use CROSS_PREFIX=
-#   $ make CROSS_PREFIX=x86_64-linux-gnu-
+#
+# Copyright (c) 2018 Red Hat, Inc. and/or its affiliates
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+#
+
+TARGET_LIST = i386
+
+SRC_PATH = ../..
 
 override define __note
-/* This file is automatically generated from
- * tests/migration/x86-a-b-bootblock.S, edit that and then run
- * tests/migration/rebuild-x86-bootblock.sh to update,
- * and then remember to send both in your patch submission.
+/* This file is automatically generated from the assembly file in
+ * tests/migration/$@. Edit that file and then run "make all"
+ * inside tests/migration to update, and then remember to send both
+ * the header and the assembler differences in your patch submission.
  */
 endef
 export __note
 
-.PHONY: all clean
-all: x86-a-b-bootblock.h
-
-x86-a-b-bootblock.h: x86.bootsect
-	echo "$$__note" > header.tmp
-	xxd -i $< | sed -e 's/.*int.*//' >> header.tmp
-	mv header.tmp $@
+find-arch-cross-cc = $(lastword $(shell grep -h "CROSS_CC_GUEST=" $(wildcard $(SRC_PATH)/$(patsubst i386,*86*,$(1))-softmmu/config-target.mak) /dev/null))
+parse-cross-prefix = $(subst gcc,,$(patsubst cc,gcc,$(patsubst CROSS_CC_GUEST="%",%,$(call find-arch-cross-cc,$(1)))))
+gen-cross-prefix = $(patsubst %-,CROSS_PREFIX=%-,$(call parse-cross-prefix,$(1)))
 
-x86.bootsect: x86.boot
-	dd if=$< of=$@ bs=256 count=2 skip=124
+.PHONY: all $(TARGET_LIST)
 
-x86.boot: x86.o
-	$(CROSS_PREFIX)objcopy -O binary $< $@
+all: $(TARGET_LIST)
 
-x86.o: x86-a-b-bootblock.S
-	$(CROSS_PREFIX)gcc -m32 -march=i486 -c $< -o $@
+$(TARGET_LIST):
+	$(MAKE) -C $@ $(call gen-cross-prefix,$@)
 
 clean:
-	@rm -rf *.boot *.o *.bootsect
+	for target in $(TARGET_LIST); do \
+		$(MAKE) -C $$target clean; \
+	done
diff --git a/tests/migration/i386/Makefile b/tests/migration/i386/Makefile
new file mode 100644
index 0000000000..5c0324134a
--- /dev/null
+++ b/tests/migration/i386/Makefile
@@ -0,0 +1,22 @@
+# To specify cross compiler prefix, use CROSS_PREFIX=
+#   $ make CROSS_PREFIX=x86_64-linux-gnu-
+
+.PHONY: all clean
+all: a-b-bootblock.h
+
+a-b-bootblock.h: x86.bootsect
+	echo "$$__note" > header.tmp
+	xxd -i $< | sed -e 's/.*int.*//' >> header.tmp
+	mv header.tmp $@
+
+x86.bootsect: x86.boot
+	dd if=$< of=$@ bs=256 count=2 skip=124
+
+x86.boot: x86.o
+	$(CROSS_PREFIX)objcopy -O binary $< $@
+
+x86.o: a-b-bootblock.S
+	$(CROSS_PREFIX)gcc -m32 -march=i486 -c $< -o $@
+
+clean:
+	@rm -rf *.boot *.o *.bootsect
diff --git a/tests/migration/x86-a-b-bootblock.S b/tests/migration/i386/a-b-bootblock.S
index b1642641a7..3f97f28023 100644
--- a/tests/migration/x86-a-b-bootblock.S
+++ b/tests/migration/i386/a-b-bootblock.S
@@ -3,10 +3,6 @@
 #  range.
 #  Outputs an initial 'A' on serial followed by repeated 'B's
 #
-# run   tests/migration/rebuild-x86-bootblock.sh
-#   to regenerate the hex, and remember to include both the .h and .s
-#   in any patches.
-#
 # Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
 # This work is licensed under the terms of the GNU GPL, version 2 or later.
 # See the COPYING file in the top-level directory.
diff --git a/tests/migration/x86-a-b-bootblock.h b/tests/migration/i386/a-b-bootblock.h
index 78a151fe2a..7d459d4fde 100644
--- a/tests/migration/x86-a-b-bootblock.h
+++ b/tests/migration/i386/a-b-bootblock.h
@@ -1,7 +1,7 @@
-/* This file is automatically generated from
- * tests/migration/x86-a-b-bootblock.s, edit that and then run
- * tests/migration/rebuild-x86-bootblock.sh to update,
- * and then remember to send both in your patch submission.
+/* This file is automatically generated from the assembly file in
+ * tests/migration/i386. Edit that file and then run "make all"
+ * inside tests/migration to update, and then remember to send both
+ * the header and the assembler differences in your patch submission.
  */
 unsigned char x86_bootsect[] = {
   0xfa, 0x0f, 0x01, 0x16, 0x74, 0x7c, 0x66, 0xb8, 0x01, 0x00, 0x00, 0x00,